Carburetor



, Sent. 29, 1925. A R PLAUT 1,555,604-

CARBURETOR- origi'nal Filed Jan. 5. 1918 2 sheets-sheet 1 Sept, 29,1925. A, PLAPT 1,555,504

' CARBURETOR Original Filed Jan. 3. 1918 2 Shet sh g I 3144x14 6 0'0JIPPM.

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Patented Sept. 29, "1 925 en'rornn 11?. PLAllrT, or nnass uranurac'ruarrcmean.

PATENToFFIcE.

can nunnren.

Applicatloxi an January a, rare, Serial in). 210,144. Renewed February27,; 1925.

To "all 10,107); itma-y concern:

'Be it-known that I, An'rorma P. Pmrrr, a citizen of the Republic ofFrance, residing at Flint, in the county of Gcnesee and State 5 ofMichigan, "have'invented certain newand usetul Improvements in.Carburetors, of which the following is a sp ecification,v referencebeing had therein to the accompanying drawing. I This invention relatesto certain. new and useful improvements in carburetors, the object beingto provide a carburetor without any movable parts whereby a. richermin-' ture for the slower speed and idling of the engine to which thecarburetor is attached, can be obtained automatically in a positive anda controllable manner, the specific com struction being such that byusing the laws of flow of fluids in pipes any'clesiredsize of carburetorcan cula t-ions." Another object of my invention s to pro-;

vide a carburetor with a main emulsifying 4.

chamber andan auxiliary expansion chamher, the auxiliary acceleratingchamber-be ing provided with 'a fuel inlet and having a'series of airinlets whereby the fuel entering said chamber is partly, atomized beforeit enters the main emulsifying chamber.

Another and further'object of the invention isto provide a carburetorwhich isiextremely simple and cheap in construction.

and one in'which the parts are so arranged and connected together thatthe readily assembled or taken apart. f

AL'notherand further object of the. inven tion is to provide acarburetor with novel means for delivering fuel to the motor when idlingor running the motor without a load; Other and further-objects andadvantages of the invention. will be hereinafter set forth and the novelfeaturesthereof defined by the appended claims. i

y With theseobjects. in View,

Figiire l is a vertical section through my improved constructionofcarburetor.

\ Figure 2 .isa section taken on line 22 of Fig. 3, showing the airchamber and;the auxiliary expansion chamber.

Figure 3 is a horizontal section showing the position of the expansionchambers and air chambers; and

Figure 4&3 atop plan view of the same.

- Like numerals of reference refer to like be.made according to cal- 1for connecti y can be fpartsfin; the several figures of the drawing. Incarrylng out my invention! employ 'Haibodyil which'is preferably ,formedof a" cast nghavmg an air passage '2 provided .w th a lateral inlet 3 inwhich is mounted japvalve 4 for controlling the admission of arr saidvalve being carried by ,a stem 5 ,V having an arm 6 connected thereto towhich is adapted to be'connected a dash control device in order to allowthe position of the valve 4 within the air inlet to be adjusted I forthe purposehereinafter fully described. The air passage '2 is providedwith a threaded upper-end 7. into to be screwed the threaded portion 8of a Venturi tube 9 which terminates at its upper' end in i1 throttlechamber 10 in which is mounted a throttle valve 11' of the ordinary"'cons'truction.- The wall oi the throttle chamber'is' provided with theusual flange 7 ng the same to the-intake 'mani toldof the engine. a IThe Venturi tube extends down'into the air passage as clearly-shown, andis provided with an exterior annular groove forming a mainannularemulsifying'chamber 12 from which extends a series of diagonallyarranged "passages 18 which communicate with .the interior of theVenturi tube at the most restricted portion thereof so as to form aplurality of jets-through which the -partially atomized fu Venturi-tube.

communicates with an auxiliaryadcelerating chamber 14 formed inthebody'l through a bore or passage l5iandthe auxiliary accelerlower endinto which isscrewed a lfuel nozzle Y within? the auxiliary acceleratingchamber.

.355 el is delivered into, the The annular emuisifying -chamber 12 atingchamber @isformed with a threaded i The fuel nozzle: 16 is provided witha 1 cali brated opening which'coinmunicates with a hollow-nipple 17t'ornn'edori thebody, said nipple having a drain jjc0ckL18"screwedtherein for closing the lower end-thereof" and to provide means fordrain from the fuelreservoir.

' The auxiliary accelerating'cham V provided 'with a series of'air inletducts. 19

in the body parallel with the auxiliary acingthe fuel ber-14{ isi' 10aextending from an air chamber 20 formed celeratingcharpber, air chamberfioim s pp y Pin is provided with an air tube 21 at upper end in whichis screwed a tubular valve 22 the lower end of the valve being adaptedto seat on a valve seat 23 formed in the air tube. The walls of the airtube are provided with openings 21' for admitting additional air whendesired, and it will be seen by this construction that by having thetubular valve withthe calibrated air passage apredetermined quantity ofair will be ad-" mitted to the air chamber at all times, and by \theparticular construction of valve and air inletsan additional supply ofair can be admitted into the air chamber by opening thevalve, v

The body 1 has formed integral there'- with a fuel reservoir 261 whichis provided with a fuel outlet 25 extending downwardly into the nipple17 so that fuel from the reservoir will pass through the nozzle 16 andbe delivered into the auxiliary accelerating chamber 14. The fuelreservoir 24 is closed by a removable cover 26 which is provided with afuel inlet nipple 27 to which the adapted to be connected. The cover isprovided with a valve seat 28 to receive a valve 29 controlled by afloat 30 mounted in the-fuel reservoir for main-.

taining fuel within the reservoir at a level, approximately, on the lineAA which is midway of the annular main emulsifying chamber. i

One wall of the Venturi tube 9 is enlarged as shown at 31 and isprovided with a vertical bore 32 in which is arranged a tube 33,

' the lower end of which extends into the annular emulsifying chamberslightly below the fuel level, and the upper end communicates with adiagonally upwardly extendmg The bore 33 is provided with a valve seat34, back of the bore 32 and in which is until it reaches the level,approximately,

midway the height of the main emulsifying chamber and when the motor isstarted this accumulated fuel will be forced out of the jets '13 by thecurrent of air passing through the air ducts which produces a drop inpres-- sure in the throat of the Venturi tube, by

the velocity of the air going therethrough. This drop'in pressureis feltin the main and auxiliary accelerating chambers according to thequantity of air admitted through the airducts from the air chambers,that is, if the area of the air ducts is half the area of the'jets 13,thedrop in pressure in the expansion chamber 12 will be only ha f 9?bore 33 which extends into the throttle; chamber above the throttlevalve thereof.

what it will be in the throat of the Venturi tube. The adjustable nozzlearranged in the bottom .of the auxiliary accelerating chamber willtherefore be subjected to this last depression, and as the nozzle hasits opening belowthefuel level in the fuel reservoir it will give acertain quantity of fuelfacco'rding to the suction plus another certainquantity, according to the difference in level, this,being regulated byadjusting the position of the nozzle into or out Of the auxiliaryaccelerating chamber.

When the engine is idling or the motor is runningwithout a load thevelocityof the 'air through the Venturi tube is then too low to drawthefuel through the jets 13, and the fuel will be picked up from the mainemulsifying chamber by the tube 32 and dis-- charged above the throttle,and in this way no more fuel can be fed into the motor. than can be'discharged into the main emulsifying chamber, and as the passage is ofsuch a-size as to take-care of many times as much fuel as will find itsWay into the main. emulsifying chamber the air aswell as the fuel willbe drawn therethrough; which on account of its velocity .helps to carrythe fuel and break itupbefore it is delivered above the throttle. Thesuction can be regulated by the needle controlling the air inlet fromthe atmosphere- In the operation of the carburetor, constructed inaccordance with my invention, when the engine is being started the valve4 in the air inlet is' preferably closed,and as fuel from the fuelreservoir has accumulated within the main and auxiliary chambers and theair chamber which is always open to the atmosphere, a partial vacuum iscreated within the Venturi ,tube so as to cause the fuel to be drawn outof the main expansion chamber through the multiplicity-of jets, and asthe fuel level is gradually reduced in these chambers the jets of airfrom the air chamber gradually pick up and atomize the fuel in theauxiliary accelerating chamber until theaccumulated supply has beenexhausted so that the initial mixture is very rich so as to facilitatethe'start= ing of the motor: to which the carburetor is attached. As themotor continues to run, fuel is constantly being delivered into theauxiliary expansion chamber through the nozzle, and as air is enteringthis chamber l through the series of air jets the fuel is partiallyatomized, and by the suction of the" engine isdrawn into the mainemulsifying chamber from which it is delivered into the Venturi tubethrough the series of jets so that the incoming air will absorb and completely mix the partially mixed ex losive mixtures before it isdelivered into e engine, it of course being understood that the valveinthe air inlet only held closed on seeme m tor,

' through,

The fuel level is maintained afiproirh mately midway of the emulsifyingc amber 12 of the compound chambers and when the motor is started,whatever fuel is in the chambers 12 and 14 as well as in the chamber19'will be rushed out through the atomizing jets 13 by the currents ofair blowing through the air ducts 19 on account of the drop in pressureproduced in the tnroat'of the venturi by the velocity of the air goingthis drop in pressure being felt in chambers 12 and 14 according to thequantity of air admitted throughthe ducts 19, that is, if the area ofthe air ducts 19 is'half the area of the jets 13, the drop in pressurein the chambers will be only half of what it would be in the throat ofthe venturi; the nozzle 16 at the bottom of the chamber 14 willtherefore'be subjected to the last de pression, because, the nozzle'16has its opening below the fuel level in the float chamber. Thisnozzle delivers a'certain quantity of fuel according to the suction plusanother certain quantity according to the difference in level, this lastquantity being regulated by letting the end of the nozzle proiect moreor less into the chamber 14.

This construction provides means for delivering to the engine the propermixture according to its load, and when the engine is idling thethrottle is substantially closed,

and the velocity of air passing through the Venturi tube is reduced tosuch an extent as to be too low to carry the fuel, and as the passageconnected with the throttle chamber above the throttle is incommunication with the main emulsifying chamber, fuel and air will bedrawn from the emulsifying chamher and delivered above the throttle fromwhich it will be sucked to the engine so as to deliver the propermixture thereto.

I claim:

1. A carburetor comprising-a body having an air passage-being providedwith a constant level fuel reservoir, a Venturi tube fuel nozzleextending mounted in the upper end of said air assage, an'exteriorannular groove forme on said Venturi tube forming an annular chamher,said annular chamber being in communication with said Venturi tubethrough a series of unclosable passageways, an auxiliary chamber incommunication with the annular chamber, a nozzle disposed in saidauxiliary chamber below the fuel level of said reservoir and an airreservoir having a plurality of ducts communicating with said auxiliarychamber.

2. A carburetor comprising a body having an air passage provided with avalve control air inlet, a Venturi tube mounted within the upper end ofsaid air passage having a throttle valve at its upper end, a constantlevel fuel reservoir, a chamber surrounding said Venturi tube and incommunication therewith through a series of unclosable passageways, anauxiliary chamber. in communioation with the annular chamber, a intosaid auxiliary chamber for delivering fuel constantly thereto, and anair chamber having a series of ducts disposed in different horizontalplanes communicating with said auxiliary chamber.

3. In a carburetor, the combination with. a constant level fuelreservoir, of a vertically disposed Venturi tube having an annularemulsifying chamber in communication therewith through a series ofunclosable passageways, the bottom of said emulsifying chamber beingbelow the fuel level of said reservoir, an auxiliary chamber forming anaccelerating well having a fuel nozzle at its bottom below the fuellevel of said reservoir and in open communication with said annularemulsifying chamber, an air chamber and a series of air ductscommunicating with said accelerating well.

In testimony signature.

ANTOINE P. PLAUT.-

whereof I hereunto afliz; my

